Cerium Oxide Nanostructures on Titania: Effect of the Structure and Stoichiometry on the Reactivity Toward Ethanol Oxidation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F18%3A10425357" target="_blank" >RIV/00216208:11320/18:10425357 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=QUUy8naRPY" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=QUUy8naRPY</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1021/acs.jpcc.8b05807" target="_blank" >10.1021/acs.jpcc.8b05807</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Cerium Oxide Nanostructures on Titania: Effect of the Structure and Stoichiometry on the Reactivity Toward Ethanol Oxidation

Popis výsledku v původním jazyce

Nanocatalysis is a multidisciplinary field in which catalytic reactions are explored, understood, and improved by means of surface science methods. Model systems are a good playground to develop new interfaces where uncommon geometries and special active sites are stabilized. Cerium oxide deposited on titanium dioxide represents a good example of this. Thanks to a charge transfer from the titania support, Ce3+ sites grow at the interface. Thick cerium oxide layers show both Ce3+ and Ce4+ oxidation states, whereas only Ce3+ is detected in the monolayer. This demonstrates that the charge transfer is limited to the interface. In the present study, we grew and characterized two cerium oxide layers having different thicknesses, namely, 2 and 6 monolayer equivalents, on rutile (110), and investigated their reactivity toward the partial oxidation of ethanol. Our results show that the selectivity and the reaction mechanism are affected by the thickness of the cerium oxide. In particular, a stoichiometric reaction involving surface oxygen sites takes place on the thinner reduced film, whereas at higher ceria coverage, the presence of the Ce3+Ce4+ redox couple favors a catalytic reaction in which gas-phase oxygen is activated on ceria and then reacts with adsorbed ethanol.

Název v anglickém jazyce

Cerium Oxide Nanostructures on Titania: Effect of the Structure and Stoichiometry on the Reactivity Toward Ethanol Oxidation

Popis výsledku anglicky

Nanocatalysis is a multidisciplinary field in which catalytic reactions are explored, understood, and improved by means of surface science methods. Model systems are a good playground to develop new interfaces where uncommon geometries and special active sites are stabilized. Cerium oxide deposited on titanium dioxide represents a good example of this. Thanks to a charge transfer from the titania support, Ce3+ sites grow at the interface. Thick cerium oxide layers show both Ce3+ and Ce4+ oxidation states, whereas only Ce3+ is detected in the monolayer. This demonstrates that the charge transfer is limited to the interface. In the present study, we grew and characterized two cerium oxide layers having different thicknesses, namely, 2 and 6 monolayer equivalents, on rutile (110), and investigated their reactivity toward the partial oxidation of ethanol. Our results show that the selectivity and the reaction mechanism are affected by the thickness of the cerium oxide. In particular, a stoichiometric reaction involving surface oxygen sites takes place on the thinner reduced film, whereas at higher ceria coverage, the presence of the Ce3+Ce4+ redox couple favors a catalytic reaction in which gas-phase oxygen is activated on ceria and then reacts with adsorbed ethanol.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

—

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Physical Chemistry C

ISSN

1932-7447

e-ISSN

—

Svazek periodika

122

Číslo periodika v rámci svazku

36

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

8

Strana od-do

20809-20816

Kód UT WoS článku

000444920900027

EID výsledku v databázi Scopus

2-s2.0-85052371097